Known issues and their solutions are listed on this page.
If you found an issue not listed here you may post a new issue.

PhotoDB

Externally, image meta data YAML files changed but not reflected in PhotoDB

Image metadata is rescanned for changes at request only.
Start the task photo_refresh to initiate a metadata rescan. Also at application restart metadata is rescanned.

PhotoApp

Image browser page shows placeholders instead of images

There is a known issue changing to image browser page some time showing no images.
Move the mouse wheel to refresh the view. Then the images will show.

Image browser page slowly loads all thumbnail images

The thumbnail images may be not in the thumbnail image cache.
New images are processed and stored in the cache by task photo_update_thumbs.